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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657f14cfcf7b8f8cb64ea2c1d385bc019959bfb431ad6cf5151d08b64acc7a5b' 
  AND token = 'fI/qIpaIXGwZnlis2Xy1bfVpbNjkbr97fT6j+uYU78w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}